Antrodiaetus ashlandensis , Cokendolpher, James C., Peck, Robert W. & Niwa, Christine G., 2005

Cokendolpher, James C., Peck, Robert W. & Niwa, Christine G., 2005, Mygalomorph spiders from southwestern Oregon, USA, with descriptions of four new species, Zootaxa 1058, pp. 1-34: 16-17

publication ID

10.5281/zenodo.170130

publication LSID

lsid:zoobank.org:pub:AFAA0F3F-B38B-4790-ACDB-6424429EA725

persistent identifier

http://treatment.plazi.org/id/F305878B-F74C-FFEC-553E-FACAFD9DF8C5

treatment provided by

Plazi

scientific name

Antrodiaetus ashlandensis
status

n. sp.

Antrodiaetus ashlandensis  n. sp.

Figs. 1View FIGURE 1, 7View FIGURE 7, 11View FIGURES 8 – 11, 19–20View FIGURES 16 – 21, 22–23View FIGURES 22 – 33, 34View FIGURES 34 – 37, 38 –39View FIGURES 38 – 41, 49View FIGURES 49 – 52

Type Material. Oregon (all collected in 1998 by Niwa and Peck USFS): Jackson County, Ashland Watershed, Ashland Ranger District, Rogue River National Forest: N 42 ° 85 ’8.0”, W 122 ° 42 ’ 24.9 ” (1000–1146 m elevation), 29 Sept. (3m, AMNHAbout AMNH), 11 Oct. (male holotype, NMNHAbout NMNH), (4 male paratypes, JCC); N 42 ° 9 ’ 50.2 ”, W 122 ° 42 ’ 24.9 ” (926–1024 m elevation), 11 Oct. (4 male paratypes, WFIC); N 42 ° 8 ’58.0”, W 122 ° 41 ’ 14.3 ” (1219–1268 m elevation), 29 Sept. (1 male paratype, JCC); N 42 ° 8 ’ 5.7 ”, W 122 ° 42 ’ 24.9 ” (1463 m elevation), 11 Oct. (1 male paratype, JCC); N 42 ° 8 ’ 5.7 ”, 122 ° 41 ’ 14.3 ” (1317–1365 m elevation), 29 Sept. (2 male paratypes, AMNHAbout AMNH), 11 Oct. (3 male paratypes, TTUAbout TTU).

Diagnosis. The separation of this species from others of the region requires examination of several characters. The combination of no cheliceral distodorsal projection or setal coat on upper ectal surface ( Figs. 19View FIGURES 16 – 21, 34View FIGURES 34 – 37), having all three dorsal opisthosomal sclerotized patches separate ( Fig. 11View FIGURES 8 – 11), and by having a prolateral brush of macrosetae on tibia I ( Fig. 38, 39View FIGURES 38 – 41) will distinguish the new species from all congeners except A. pugnax  and A. occultus  . It can be separated from A. pugnax  by not having the leg I segments of the male enlarged ( Fig. 48View FIGURES 47, 48 versus Fig. 38View FIGURES 38 – 41) and from A. occultus  it differs by not having the macrosetae of tibia I extending to the distal end ( Fig. 47View FIGURES 47, 48 versus Fig. 38View FIGURES 38 – 41).

Etymology. The species name is based on the region of Oregon where this spider was discovered.

Distribution. Known only from Ashland Ranger District, Rogue River National Forest, Jackson County, Oregon ( Fig. 1View FIGURE 1).

Description. Female unknown. Male (n = 19): body large, total body length 11.4 (9.6, 11.5). Color: orangish­brown, sclerotized patches on opisthosoma more evenly brown, dark brown pigment encircling anterior median eyes and between posterior median and lateral eyes.

Dorsal shield of prosoma 5.5 (5.05, 5.85) [mean ± s.d., 5.44 ± 0.23 (n = 19)] long, 4.35 (3.9, 4.55) wide, with setae scattered sparsely over pars thoracica except very densely along lateral and posterior borders.

Opisthosoma 5.9 (4.55, 5.65) long, 4.1 (3.3, 4.15) wide; all three dorsal sclerotized patches separate ( Fig. 11View FIGURES 8 – 11); male genital plate with sclerotized parts divided, straight to recurved ( Figs. 22–23View FIGURES 22 – 33).

Chelicera with large area on upper ectal surface without setae; without distodorsal projection ( Figs. 19View FIGURES 16 – 21, 34View FIGURES 34 – 37).

Palp with tibia swollen. Tibia 2.56–2.68 times longer than wide; widest in proximal third; 3.2 (3.1, 3.35) long, 1.25 (1.2, 1.25) wide. Tip of outer conductor sclerite ( Fig. 49View FIGURES 49 – 52) roundly pointed; not appressed to inner conductor sclerite. Tip of inner conductor sclerite well sclerotized and not curved.

Leg I ( Figs. 38–39View FIGURES 38 – 41) without any segment being greatly enlarged or modified with processes; femur 5.6 (5.25, 5.8) long, patella 2.2 (2.15, 2.45) long, tibia 3.75 (3.6, 3.9) long, 0.8 (0.75, 0.95) wide, metatarsus 4.35 (4.1, 4.45) long, tarsus 2.7 (2.4, 2.75) long. Tibia I with relatively dense group of prolateral macrosetae medially (not reaching distal end of segment). Macrosetae with 40.5–43.3 % being ensiform: with 26 (11 ensiform) [30 (13 ensiform), 37 (15 ensiform)] macrosetae. Tibia I with 11 (7 large) [11 (7 large), 13 (8 large)] medial (not extending to distal end) macrosetae ventrolaterally, the longest seta at most about width of tibia (about as long as prolateral macrosetae). Tibia I without large heavy macrosetae ventrally; tibia and metatarsus I not swollen in lateral view; metatarsus I sinuous, without macrosetae ventrally; other setae ventrally on metatarsus I = 2 times greatest width of segment.

Wandering Activity. All 19 males were collected on 29 September (6) and 11 October (13) 1998 ( Fig. 7View FIGURE 7).

Comment. Antrodiaetus ashlandensis  n. sp. was collected in 9 of 18 sites within the eastern Siskiyou Mountains study area. Six of the sites had previously experienced prescribed underburning.

AMNH

American Museum of Natural History

NMNH

Smithsonian Institution, National Museum of Natural History

TTU

Texas Tech University, Museum